Apparatus for aerating and cleaning flour, grits, and the like.



PATENTE) FEB. 1Q; m07.

G. TRETTAU.

AFFARTUS EUR AERATING AND CLBANJNG FLUUR, GRS, AND THB LIKE.

APPLICATION FILED NOV. 2, 1906.

ATENT hhiCE.

CARL TRETTU, OF GMMEL, GERMANY. APPARATUS FOR ARATING AND CLEANING FLOUR, GHITS, AND THE LIKE.

No. seame-v Specification of Letters Patent.

Patented Feb. 19, 1907.

Original applicatidn filed October 17, 1905, Serial No. 283,198. Divided and this application Vfiled November 2, 1906. Serial No. 341,678.

To all whom t may concern:

solely @Be it known that l, CARL TRETTAU, a subject of the King of Prussia, residing at Gimmel, district Oels, Province of Silesia, and German Empire, have invented new and useful Improvements in Apparatus for Aeratin and Cleaning Flour, Grits, and the Likeyoi' which the iollovvin@ is a specification. The subject of the present invention is an apparatus for aerating and cleaning iiour, grits, and thelike.

his application is a division of my application, Serial N o. 283,198, filed October 17, 1965.

By means of this invention not only is the :deur or like material rendered capable of keeping better, but any impurities-such as bacteria, fungi, and living organisms, (as, for instance, moths, moth-eggs, worms and their breed, ic.,) Which may get into the iinal product during treatment or" the grain in the mill-are destroyed. ln this manner the our is improved from an hygienic standpoint and also rendered finer to the eye, owing to the cleansing.

Various attempts have already been made by millers to fine or purify flour by chemical means. The processes proposed for the purposehowever, have not come into general use, as the chemical agents employed are themselves injurious to the health and detrimentally aflect Allours destined for purposes of nutrition. All these processes based on. the treatment oi the Yflour with chemical agents must, therefore, for hygienic reasons be condemned.

The present 'invention .is based upon the fact that the objectionable tendency of iiour to become very quickly tainted by foreign odors'and to go bad after a relatively short space of time is due to the flour from the iirst not having been brought into intimate contact with fresh pure active air and, on the other hand, to its having during its conversion into bakers iiour become mixed with extremely large quantities of organic impurities of the kind already stated, such as it is impossible to avoid when milling is carriedl on as at present.

The purpose of "the neu/apparatus embodying my invention, therefore, is tothoroughly serate the, flour either after or during the grinding processes by means of pure active air and at the same time to destroy the inn j uri ous organic impurities, whereby the hour is cleaned and is rendered capable of keeping better, its appearance also being improved. This is done by conducting through the descending flour by means of a ventilator, pump, or the like a weak current of atmospheric air heated, preferably, to a very high degree. By preference this is carried out in the bolting-machine, (Whether with riait sie'ves, cylinders, or the like.) The heating oi the air is eiiected by causing the air sucked or forced into the bolting-machine before entrance into the bolt to pass a iiame of an extremely high temperaturc-such as, for instance, therV flame of an oxyhydrogen blowpipe, of an electric arc, or the like.

In the case of good quality iiour containn ing but few microbes and like impurities thorough aerating by means of cool but pure active air-or example, at a tempera-- ture of about 30 oentigrade-is sufiicient. In the event of the flour being highly contaminated, on the contrary,"` the air should be the hotter the greater the degree of impurity and moisture. In the former case the fresh# ened air comin from the heatingdiaine should not be directly conducted into the stream of flour, but iirst cooled in any suitable and Well-known manner before being conducted into the bolting-machine or the like.

Owin to the extremely high temperature of the ,ame of the blowpipe or aro,the air will be so hi hly heated that not only Will the pathogenic acteria and errns in the air be killed, but the air will e simultaneously perfectly dried. Furthermore, the hig temperature of the ilame acts upon the air passing through in such `manner that the latter even after being very much cooled down still possesses the power of destroying germs. Despite such cooling vthe air thus enters the bolt in a condition which results in destruction of the bacteria and germs.

One form of construction of the apparatus is illustrated in the accompanying drawing, in which the i ure is an elevation and part section. The heating is here shown to be ,done by means of electric arcs, which have latter apertures are provided, over which small cylinders c are disposed. Above the cylinders electridarc lamps d are suspended in such manner that the arc lies above the mouth of the cylinders c. The hopper a ter- IOO the advantage oIn chea ness and cleanliness.

a is a hopper closed y a plate b. In the i minutes below ,in Lubulzn poitioin e, to which lllio pipofis connected. la w. poi: Cooling :md puri y'iiig ilovioo is uisoitoil in lio pipef. The Ventilator ,7L SuokS fzii li'om tlio plier@ post tlio (as, through iii@ oylin-zlolS c', and into the hopper a. lo oiilvi', that poi-"ticlos falling from 1li-o lmnp@ ons and my other impurities mi not @hier lio pipo f f1. screen or 'llliei i is piofidm'i iii Lilie hoof,- i'. The air illus tiii'ow ibis Servon :und is further Plasma( Lifl Cool( m lilo Wol opu- Iifying apparatus y or iii :my oilioi' seuimble nimmer. .llio oir is than coiifluoicl fliioot 'iiico the bollino-mmliine, wlioro bycoutoot with the :iiic-ui'ient llio iioiii oi' tho like, is cleansed :mil 'freed lii'oi'ii all germs :mil itS op poximiioo ieiifloioil pilier. providml with Simili 'inmili While lio tubulin' po't l clotoolioblo bottom iii Judo? apparatus boing rlcniiicil out.

"il lint l (lo claim is my iimoiiliion, and dosire to s cui@ by Loies Potent, is-- l. Apparatus for oeioiiig :ind cleaning l'loui, gi'ilS :uid the like, oompiiflug zi olmmH bei" lin-ving apertures, homing iiioiz'ns located bololo the lr. lvi, :in Fr-lum loading from the clioiriboi to L descending; Siiofuiii of the. material to bo ti'ozioi'l, :mil moons ilioi Causing o' current of ziii' to panos through lio sopor?,- tlis to tho said iiiiitoriil, substzmtizilly :is described. l i,

2. Apparatus for affirming and cleaning flour, and like, ooi i'pising clmmbQ-i having apertures, beating' moons located bollore the lotto?, on :iii'-duo leading liiomli ol'iainbm' to L descoiiding Stream. of tho mail@ to be tioaecl, an oir-Cooling; flovoo oonnected ilo llm'zr-(luot, imcl menus for (musing :i ouii'oiilw of nii to poss through die to lli@ Said moiei'iiil, substantially afs closoiiboil.

3. ilil'paizitus for aoi'zitng and olomiiiig llour, grills; and the. like, oompisiiig o hopper l'imf'ing ,pciliii-?s, fleoiic :Tros located boli-oro the lfbtol', :no oir-clust leading; fiom the hop por lo :1. boligigmizioliiuo mid means foi cousin: i ouieiib olf ziii to pass tln'ougli ille apparatus to lli@ Suid marchi* o, substmiizilly :is flosori b el l Ll. ilppmailus for :Hunting and claiming iloiii', grits :mil ilio like, comprising n, hopp@- liiicing' ifpcil uros, @loof io mcs bolforo ilio loller, mir-(luci. l filling l'oin *alle hop por lo :i l oll;'ingmfiobiim, ovfiitooooling do vio@ connected in the :ii1-x luot, and moz-iis lbf Causing :L current ol" oir lto poss through the appara-tus iio the said machine, substantially :is (log ibod. y

'.n testimony Wlieoof llfwo signed my immo to l'liis Specification in. the. presence of two subscribing Witnesses.

CARL TRETTAU.

llfitnessos:

OTT@ W. HELLMMCH, DA Ciims'r. RAFERLLMTN,

il, O 

